Diquat
Gretna Waterworks
Diquat is a herbicide used on potato crops and aquatic weeds.
20
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 6 ppb
The EWG Health Guideline of 6 ppb for diquat was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cataracts.
EPA Maximum Contaminant
Level (MCL) 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-04 | AD88741 | ND |
| 2014-02-04 | AD88741 | ND |
| 2015-03-16 | 35179807002 | ND |
| 2015-03-16 | 35179807002 | ND |
| 2015-10-14 | 35212328002 | ND |
| 2015-10-14 | 35212328002 | ND |
| 2016-01-27 | 35226999002 | ND |
| 2016-01-27 | 35226999002 | ND |
| 2016-12-13 | 35283615004 | ND |
| 2016-12-13 | 35283615004 | ND |
| 2017-02-22 | 35296827002 | ND |
| 2017-02-22 | 35296827002 | ND |
| 2018-01-30 | 35371297005 | ND |
| 2018-01-30 | 35371297005 | ND |
| 2018-10-02 | 35421766001 | ND |
| 2018-10-02 | 35421766001 | ND |
| 2019-02-05 | 35446730001 | ND |
| 2019-02-05 | 35446730001 | ND |
| 2019-08-14 | 35490413001 | ND |
| 2019-08-14 | 35490413001 | ND |